基于改进F-AHP模型的典型公路边坡稳定性研究

Research on typical highway slope stability based on improved F-AHP model

路堑边坡的稳定受多因素耦合作用,因此无论何种评价机制,其结果的准确性在于边坡稳定性影响因素指标的权重。引入三角模糊数的理论,解决了在进行路堑边坡稳定性评判时风险因素的含糊性、不确定性和主观性;综合考虑路堑边坡岩土体性质、地形地貌、外界因素和人为因素建立基于三角模糊数改进的F-AHP稳定性评价模型。并将此模型运用于三峡高速(S58)公路伍家岗收费站段路堑边坡的稳定性评价,结果表明:此路堑边坡为较稳定状态,其概率为40.74%;同时采用Geo-Studio中的SLOPE/W模块求得此路堑边坡安全系数为1.079,处于较稳定状态,与数学评价模型评价结果一致,验证了所建模型的科学性与合理性。

The stability of the cut slope is affected by the coupling of multiple factors,so the accuracy of the results depends on the weight of the factors affecting the slope stability.This paper introduces the theory of triangular fuzzy number to solve the ambiguity,uncertainty and subjectivity of the risk factors when judging the stability of cutting slope.The F-AHP stability evaluation model based on triangular fuzzy number is established by considering the rock and soil properties,landform and geomorphology,external factors and human factors.The model is applied to the stability evaluation of the cutting slope at wujiagang toll station of three gorges expressway(S58).The results show that the cutting slope is in a relatively stable state with a probability of 40.74%.At the same time,SLOPE/W module in geo-studio is adopted to get the safety factor of this cutting SLOPE is 1.079,which is in a relatively stable state,which is consistent with the evaluation results of the mathematical evaluation model,which proves the scientificity and rationality of the established model.